coal pulverizing machine



Aug. 7, 1928. v 1,679,997 A E. v. VERNON Al. i

Pskcy' I VERNON WITN ESSES RALPH JACKSON a. 1f @W Y www mw @Tm y ATTO Ngvtill Patented Aug. 7, 1928i UNITED STATES PATENT OFFICE.

EPERGY VENABLES VERNON, 0F KERESLEY, NEAR CVENTRY, AND RALPH JACKSON, OFGVENTRY, ENGLAND, ASSGNORS T0 ALFRED IHERBERT LIMITED, 0F BUTTS,'VENTRY, ENGLAND, .A BRCLISH COMPANY.

COAL-PULVERIZING MACHINE.

,Application iled April .12, 1926, Serial No. 101,249, and in GreatBritain May `52, 1925.

This invention relates to coal and similar pulverizing machines, of thekind in `which a passage broadly of Yshape is employed in .connectionwith the supply of coal to the machine, to enable metal or other partsliable to injure the mechanism to be separated. betoi-el entry into themachine. The coal to he pulveriz'ed descends one branch oit the Y andencounters an upward blast oit air from the stem portion thereof, andthis is adapted to drive the coal through the other branch oit the Yinto the machine, While allowing the metal or other parts to fallthrough the stem part oi the passage by which the air enters.

The elliciency of such a separating device largely depends uponobtaining the correct degree of tortuosity of the passages and also thecorrect air velocity through them, and the object of the presentinvention is to provide simple means by which these results can bequickly and easily obtained, and also to provide ready access to theadjusting means and to such parts of the passage as may becomeaccidentally choclred in use.

According to `our invention, We provide a separator construction inWhich a passage is arranged lor an air current movingin a substantiallyupward direction. Material is introduced into this air current throughan opening in one Wall of the passagc. le provide means or varying thevelocity of the air current moving past this opening, and this may besuitably accomplished by varying the area ot the air passage both aboveand below the incoming stream ol material. Ve also provide means forvarying the tortuosity of the passage, by adjusting the position of thepoint around `which the material flows on entering the air current, orby adjusting the effective length of the air passage beyond the materialopening. By means oi the different adjustments provided, the device maybe easily adapted to various materials and diverse conditions ofoperation.

lnthe accompanying drawings, which illustrate a preferred constructionof the separator passages,

Figure l is a vertical section through the part of the machine in whichthe passages are provided, the plane of the section being parallel tothe axis ol' the machine, and

Figure 2 is a cross section on the line ITL-Il ot Figure l.

l In gne method of carrying out the invention, in which the Y-piece isconstituted by an arrangement of partitions .in a hollow column 2 ofsubstantially rectangular shape located at one side of the pulverizingchamber t3,` the feeding mechanism (not shown) is arranged at, andmounted upon, the upper part 4 of the column, thefeed enterin the latterthrough the aperture 5. D

The Y-passages may be unsymmetrical, and to form them, a partition 6startine` from the upper part of the side of the colgumn .remote fromthe pulverizing chamber extends downwards from the edge of the aperture5 at an inclination toivards the middle of the column. Here it iscontinued by a part 'T slightly curved towards the side ci? the columnfrom which the partition commenced, and thereafter at 8 is inclinedsteeply towards the lower end of: the same side of the column.

The outlet `to the pulverizing chamber is an aperture 9 in the innerWall 10 of the column, and from the upper and lower edges el thisaperture extend other parti tions in the column indicated respectivclvat 11 and .12, and these co-operate with this partitions 6, 7 and 8 toform the Y-passage. The partition 11 forms a downwardly inclined lip atthe upper portion olf the outlet .9, and extension 13 of the lower edgeoit the lip terminating at about the middle ot'the curved part 7 of thepartition above mentioned. The lower edge of this exten! sion 13 `formsthe corner constituted by the junction of the two branches of the Y, oneo'fnfhich receives the material from the supply device, as indicated bythe arrows,

Whilst theother forms an upwardly inclined supply branch to thepulverizing chamber 3. The lower edge of the aperture 9 is -or a shortdistance inclined substantially at right angles to the lower sideot thelip 1l, and thereafter it unites with the partition 12 previouslyreferred to, but as will be seen, the lower part oi? this partition 12eventually is continued vertically downwards at 14. Thus, as will beseen, the

partition 12, 14 divides the lower part ot the column into tivo parts,of which the right hand part 15 serves for the introduction of hot airto the pulverizing chamber through the aperture 16, While the left handpart 17 y a tortuous path `isprovided for the coal into the machine,inasmuch as it first descends the supply branch 18 and then, by thecurrent of air entering Ythe part 17 at the lower part of the stem 19,it is swept round the bend 20 of the Y through the Voutlet branch 21 andinto the pulverizing chamber. The degree of tortuousness is dependentvupon the relationship between the lower edge of the lip .13 forming thebend or cornerof the Y and the vlower edge 22 of the vaperture 9connecting with the pulverizing chamber.

By one feature, therefore, of the present invention, a slidable plate 23is mounted upon the partition 12 forming the lower wall of the branchinto the pulverizing chamberL and it can be raised or lowered so thatits edge 24 acts as the lower edge of the aperture 9 and has its levelcorrespondingly altered, whereby, as will'be evident, the passage roundthe` bend and into the chamber is made more or less tortuous. Thisvplate may be provided with a lug 25 formed by anging over a projectingportion along one of its edges, and an elon,n gated slot 26 can beprovided in this iiange for astud or bolt 27 which is provided to extendthrough it and permit of clamping it at the desired extension.

ABy a further feature of the invention, the previously mentioned curvedportion 7 of the wall of the Y- iece is formed on a plate 28 which isvertically slidable within the column 2. The continuity of the partition6 is thus interrupted, and to prevent leakage and allow relative slidingmotion they are `arranged to overlap at 29. Movement of this platevaries the distance of the Yteration in section.

partition 8 from the opposite one 12 thus varying the cross section ofthe rising pas j sage between them, and consequently the air velocitytherein.

The lower edge of the lip 13 forming the that the plate may be raised orlowered as desired to make the desired adjustments.

rlhere is an aperture in the side of the column which is closable by adoor 3a having a quick fastening device 35, and this aperture exposesboth the adjustable members 23 and 28 and also gives access to theinterior of the Y-piece at the junction of the branches with the stem.It is thus possible quickly to make such adjustments as may be necessaryto suit the coal supplied to the machine, and should any obstructionoccur at this part it can quickly be reached and the trouble remedied.

In a certain type of machine to which this invention is applied, themechanism of the pulverizer is carried by a shaft which eX- tendshorizontally through the column containing the Y-piece. A space 3G,therefore, is provided in the column for the shaft, by means of spacedpartitions 37 uniting with one another above the shaft at 38, and, ifdesired, below it also. There may therefore be Y-pieee passages on cachside of the space 36, as clearly shown in Figure 2, and the passagesunite ,in the column at the upper and lower end. Vith this arrangement,a closabie aperture 33 is provided to give access to each of theadjusting means and interiors of the Y-piece. The shaft extends throughapertures 39 in the walls of the column.

From the foregoing it will be seen that effective separation of themetal or the like from the coal to be pulverized can be ensured byadjustment not only of the form of the passages but also by the changein intensity of the air currents obtained at the point of separation, byaltering the eii'ective cross-sectional area of the upwardly directedair passages.

lVhat I claim as my invention and desire to secure by Letters Patent ofthe United States is 1. A separating device comprising walls defining anair passage extending in a generally upward direction, one of said wallshaving therein an opening for material to be fed downwardly into thepassage against the upcoming current of air, and means for varying thecross-sectional area of said air passage both above and below saidopening.

A2. A separating device comprising walls deiining an air passageextending in a generally upward direction, means forming an opening forthe `introduction of material 4from above into an intermediate portionof said passage, and means for varying the relative position of thewalls of said passage both above and below said opening.

3. A separating device comprising walls deining an air passage throughwhich air may flow in a substantially upward direction, and means foradjusting one of said walls relative to the opposite wall, saidadjust-able wall having an opening therethrough Yfor the introduction ofmaterial into said air passage.

4. A separating device comprising walls defining an air passage throughwhich air may How in a substantially upward direction, means forming anopening for introducing material into said air passage, and means forvarying the tortuosity of the path through which said material travels.

5. A separating device comprising walls defining an air passageextending in a substantially upward direction, means forming an openingfor introducing material into said passage, and means for varying theeffective length of the air passage above said opening.

G. A separating device comprising walls defining an air passage throughwhich air may flow in a substantially upward direction, means forming anopening for the lintroduction of material into said passage, and meansfor varying the position of the upper edge of the wall opposite saidopening.

In testimony whereof We have signed our names to this speciication.

PERGY vENABLEs VERNON. RALPH JAcKsoN.

